When capturing the diminishing returns of an X variable in a linear regression, Y 2 g l lX + ,82X2 l 6. Which of the following is correct? A If the parameter for the square term is positive [32>0, it indicates diminishing returns of X on Y, meaning as the value of X increases, its marginal impact on Y is getting smaller. B If the parameter for the square term is negative 62O it indicates diminishing returns of X on Y. D If the parameters for both the linear term and the square term are positive B1>0 and [32>O, it indicates diminishing returns of X on Y